GB2202171A - Tool for dressing gear-finishing tools - Google Patents

Tool for dressing gear-finishing tools Download PDF

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Publication number
GB2202171A
GB2202171A GB08725854A GB8725854A GB2202171A GB 2202171 A GB2202171 A GB 2202171A GB 08725854 A GB08725854 A GB 08725854A GB 8725854 A GB8725854 A GB 8725854A GB 2202171 A GB2202171 A GB 2202171A
Authority
GB
United Kingdom
Prior art keywords
teeth
coated
dressing tool
dressing
tool
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08725854A
Other versions
GB2202171B (en
GB8725854D0 (en
Inventor
Manfred Erhardt
Herbert Loos
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hurth Verwaltungs GmbH
Original Assignee
Hurth Verwaltungs GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hurth Verwaltungs GmbH filed Critical Hurth Verwaltungs GmbH
Publication of GB8725854D0 publication Critical patent/GB8725854D0/en
Publication of GB2202171A publication Critical patent/GB2202171A/en
Application granted granted Critical
Publication of GB2202171B publication Critical patent/GB2202171B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23F—MAKING GEARS OR TOOTHED RACKS
    • B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
    • B23F23/12—Other devices, e.g. tool holders; Checking devices for controlling workpieces in machines for manufacturing gear teeth
    • B23F23/1225—Arrangements of abrasive wheel dressing devices on gear-cutting machines
    • B23F23/1231—Arrangements of abrasive wheel dressing devices on gear-cutting machines using a gear-shaped dressing tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/06—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels
    • B24B53/08—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels controlled by information means, e.g. patterns, templets, punched tapes or the like
    • B24B53/085—Devices or means for dressing or conditioning abrasive surfaces of profiled abrasive wheels controlled by information means, e.g. patterns, templets, punched tapes or the like for workpieces having a grooved profile, e.g. gears, splined shafts, threads, worms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
    • B24B53/12—Dressing tools; Holders therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Description

a h 2'/"-'02171 1 M&C FOLIO: 230P 54890 Dressing tool in the form of a
toothed wheel The invention relates to a dressing tool for dressing abrasive toothed wheel-like fine-machining tools. having a metal base in the form of a toothed wheel. which has teeth of which the flanks are coated with extremely hard abrasive granules. in particular made of diamond or cubic boron nitride Such tools are well known. Thus DEOS 23 06 780 describes a toothed base having its flanks coated with diamond granules. Coating with grains of cubic boron nitride (CBN) is described in DE-OS 32 02 695.
The coating of the tooth flanks of the tool, in particular when there is a large number of teeth, is very time-consuming. and therefore expensive. In particular. the grinding of diamond coatings requires an enormous amount of time. If tools are to be dressed which are required for the fine machining or finishing of only small series of gear wheels. the total costs are many times too high due to the high costs of the dressing tool.
Hence it is already known to omit whole teeth in the case of dressing tools having a coating of extremely 219-02171 2 hard abrasive grains such as diamond or CBN (DE-OS 33 46 189) so that only a relatively small number, as a nominal number of teeth, need to be coated and ground. It could, however, be considered a disadvantage of such a tool that it must be inserted in the right position in the finishing tool to be dressed. This requires very expensive aids such as position indexing, point switching, guide wheels etc.
The object of the invention is to provide an abrasive dressing tool, which is quick and cheap to produce, whilst avoi.ding the cited disadvantages.
In a dressing tool according to the invention, the coated teeth are only located in one sector of the toothed wheel. the remaining teeth are uncoated, and the thickness of the uncoated teeth is at least approximately equal to the thickness of the coated teeth including the coating. Theoretically. in this case the sector having the coated teeth could extend from one tooth up to z - 1 teeth, z being the total number of teeth of the dressing tool. It has however proved advantageous to have the coated teeth over about 900 1200 of the tool, ie about one quarter to one third of all teeth have the coating, but the thickness of the uncoated teeth must be about equal to the thickness of the coated teeth including the coating because the dressing tool is normally used in a rolling process and 1 v 3 teeth having uneven thicknesses would lead to uneven gearing ratios.
The sector with coated teeth may.be detachable for the rest of the tool. This simplifies the manufacture of the teeth which ar of different thicknesses before coating.
The essential advantage of the dressing tool according to the invention is that it is quicker and hence cheaper to make than the known tools, and flexible scope for use results therefrom. The service life of the present dressing tool is in fact shorter than that of dressing tools which are coated all round, but as the frequency of use of the dressing tool according to the invention is at the same time correspondingly shorter, this disadvantage is compensated.
Its field of application is the dressing of tools in the form of toothed wheels on so-called hard shaving machines in which the spindle receiving the shaving tool and the spindle receiving the toothed wheel workpiece to be machined are connected together via guide wheels (DE-OS 33 04 980). Due to the kinematic ratios in the shaving machine. the.uncoated teeth of the dressing tool are not machined during the dressing. by the teeth of the shaving tool to be abrasively dressed, as the latter teeth are profiled by the equally thick coated teeth in
4 such a manner that the distance between the teeth of the dressing tool and the tool to be dressed is maintained.
The invention is described below by way-of example with reference to two embodiments which are represented diagrammatically in the drawings, in which:
Fig. 1 shows a side view of a one-piece dressing tool according to the invention, Fig. 2 shows a two-part dressing tool according to the invention, and Fig. 3 shows the section on line III-III through the tool according to fig. 2.
Fig. 1 shows a side view of a dressing tool 1. it consists of a metal base 2 having a mounting borehole 10 and straight or oblique toothing around its circumference. The flanks of some of its teeth 5 are provided with a coating 4 made of very hard abrasive grains, such as diamond or cubic boron nitride (CBN). The coating of the tooth flanks and the grinding of the coated teeth 5 and the uncoated teeth 7 is known. so there is no need to go into further detail in this respect. The coated teeth 5 lie immediately behind one another in the circumferential direction within one sector 6 of the tool. which extends over about 900 to 1; 120. In other words, about one quarter to one third of the teeth 5 available overall are coated, and all the remaining teeth 7 are not coated. In the finished dressing tool the overall thickness 8 of the coated teeth 5 including the coating 4 corresponds, at least approximately. to the thickness 9 of the uncoated teeth 7. This means that the teeth 5 to be coated must be made correspondingly smaller in advance.
However. to produce teeth of unequal widths on a worKpiece requires expensive apparatus which is not always available. Therefore figures 2 and 3 show a second form of dressing tool 11 which can be manufactured on normal toothing machines. The base 2 is in this case composed of two parts 12. 13. The first part 12 has the uncoated teeth 7 and has a recess 14 into which the second part 13. having the coated teeth 5, is inserted. As it is very difficult to fit the second part 13 so accurately that it not only fits without play in the recess 14 but that there is no proportional error at the transition from the coated 5 to the uncoated 7 teeth. the two parts 12. 13 are adjustable and lockable in the circumferential direction with respect to one another. To this end. the second part 13 is provided with lateral projections 15 projecting into elongate holes 16 of the first part 12. Screws 17 are screwed approximately tangentially into the projections 15 and in each case abu,t the end of the 6 ' 6 longitudinal holes 16. By moving these screws 17, the parts 12, 13 can be adjusted relative to one another. Then they are clamped together with axial screws 18 to form a unit. In this case. setting screws are preferably used or, in addition to the screws 18. setting pins or the like. which are not shown.
The dressing tools 1. 11 are shown in figures 1 to 3 only in simplified form. Any details not necessary to the understanding of the invention have been omitted.
Instead of the straight toothing illustrated, in practice oblique or helical toothing is normally provided, and instead of the borehole 10 indicated, other mounting devices may be used.
1 1 7

Claims (4)

1. A dressing tool for dressing abrasive toothed wheel-like finemachining tools. having a metal base in the form of a toothed wheel, which has teeth of which the flanks are coated with extremely hard abrasive granules. in particular made of diamond or cubic boron nitride. characterised in that the coated teeth are only located in one sector of the toothed wheel. the remaining teeth are uncoated, and the thickness of the uncoated teeth is at least approximately equal to the thickness of the coated teeth including the coating.
2. A dressing tool according to claim 1, characterised in that the said sector having the coated teeth extends over an angle of about 90 to 120 degrees.
3. A dressing tool according to claim 1 or 2, characterised in that the said sector having the coated teeth is detachably secured to the remaining part of the dressing tool.
4. A dressing tool substantially as herein described with reference to Figure 1, or Figures 2 and 3 of the accompanying drawings.
Published 1988 at The Patent Offtce, State House, 86171 High Holboim, London WC1R 4TP. Further copies maybe obtained &om The Patent OffLce, Sales Branch, St Mary Cray, Orpington, Kent BRS 3RD. Printed by Multiplex techniques ltd, St Mary Cray, Kent. Con. 1187.
GB8725854A 1986-11-14 1987-11-04 Dressing tool in the form of a toothed wheel Expired - Lifetime GB2202171B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3638966A DE3638966C1 (en) 1986-11-14 1986-11-14 Gear-like dressing tool

Publications (3)

Publication Number Publication Date
GB8725854D0 GB8725854D0 (en) 1987-12-09
GB2202171A true GB2202171A (en) 1988-09-21
GB2202171B GB2202171B (en) 1990-07-04

Family

ID=6313961

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8725854A Expired - Lifetime GB2202171B (en) 1986-11-14 1987-11-04 Dressing tool in the form of a toothed wheel

Country Status (6)

Country Link
US (1) US4799473A (en)
JP (1) JPS63139664A (en)
DE (1) DE3638966C1 (en)
FR (1) FR2606696B1 (en)
GB (1) GB2202171B (en)
IT (1) IT1211894B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69914766T2 (en) 1998-07-31 2004-11-25 Saint-Gobain Abrasives, Inc., Worcester ROTATING DRESSING ROLL WITH SOLDERED DIAMOND LAYER
WO2006129328A1 (en) * 2005-05-31 2006-12-07 Samp S.P.A. Tool for reconditioning gear grinding wheels

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2533301C2 (en) * 1974-08-14 1983-12-01 Dieter Dr.-Ing. 7505 Ettlingen Wiener Dressing device on a gear grinding machine for form grinding helical gears
DE3346189C1 (en) * 1983-12-21 1985-06-13 Carl Hurth Maschinen- und Zahnradfabrik GmbH & Co, 8000 München Dressing tool for dressing abrasive gear-like finishing tools
JPS6119509A (en) * 1984-07-06 1986-01-28 Mitsubishi Heavy Ind Ltd Method and device for finishing gear

Also Published As

Publication number Publication date
FR2606696A1 (en) 1988-05-20
GB2202171B (en) 1990-07-04
IT8748571A0 (en) 1987-11-04
US4799473A (en) 1989-01-24
DE3638966C1 (en) 1987-08-20
IT1211894B (en) 1989-11-08
JPS63139664A (en) 1988-06-11
FR2606696B1 (en) 1992-01-24
JPH0438536B2 (en) 1992-06-24
GB8725854D0 (en) 1987-12-09

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20001104